17.12: Half-Lives for Several Radioactive Isotopes

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Page ID: 444601

Lisa Sharpe Elles
University of Kansas

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Half-Lives for Several Radioactive Isotopes

Isotope	Half-Life¹	Type of Emission²	Isotope	Half-Life³	Type of Emission⁴
$_{6}^{14} C$	5730 y	$(β^{−})$	$_{83}^{210} Bi$	5.01 d	$(β^{−})$
$_{} 7_{13} N$	9.97 m	$(β^{+})$	$_{} 83_{212} Bi$	60.55 m	$(α or β −)$
$_{9}^{15} F$	4.1 $\times$ 10⁻²² s	$(p)$	$_{} 84_{210} Po$	138.4 d	$(α)$
$11_{24} Na$	15.00 h	$(β^{−})$	$_{} 84_{212} Po$	3 $\times$ 10⁻⁷ s	$(α)$
$_{15}^{32} P$	14.29 d	$(β^{−})$	$_{84}^{216} Po$	0.15 s	$(α)$
$19_{40} K$	1.27 $\times$ 10⁹ y	$(β or E . C .)$	$_{} 84_{218} Po$	3.05 m	$(α)$
$26_{49} Fe$	0.08 s	$(β^{+})$	$_{} 85_{215} At$	1.0 $\times$ 10⁻⁴ s	$(α)$
$26_{60} Fe$	2.6 $\times$ 10⁶ y	$(β^{−})$	$_{} 85_{218} At$	1.6 s	$(α)$
$27_{60} Co$	5.27 y	$(β^{−})$	$_{} 86_{220} Rn$	55.6 s	$(α)$
$_{37}^{87} Rb$	4.7 $\times$ 10¹⁰ y	$(β^{−})$	$_{} 86_{222} Rn$	3.82 d	$(α)$
$_{38}^{90} Sr$	29 y	$(β^{−})$	$_{88}^{224} Ra$	3.66 d	$(α)$
$_{49}^{115} In$	5.1 $\times$ 10¹⁵ y	$(β^{−})$	$_{88}^{226} Ra$	1600 y	$(α)$
$_{53}^{131} I$	8.040 d	$(β^{−})$	$_{88}^{228} Ra$	5.75 y	$(β^{−})$
$_{58}^{142} Ce$	5 $\times$ 10¹⁵ y	$(α)$	$_{89}^{228} Ac$	6.13 h	$(β^{−})$
$_{81}^{208} Tl$	3.07 m	$(β^{−})$	$_{90}^{228} Th$	1.913 y	$(α)$
$_{82}^{210} Pb$	22.3 y	$(β^{−})$	$_{90}^{232} Th$	1.4 $\times$ 10¹⁰ y	$(α)$
$_{82}^{212} Pb$	10.6 h	$(β^{−})$	$_{90}^{233} Th$	22 m	$(β^{−})$
$_{82}^{214} Pb$	26.8 m	$(β^{−})$	$_{90}^{234} Th$	$24.10 d$	$(β^{−})$
$_{83}^{206} Bi$	6.243 d	$(E . C .)$	$_{91}^{233} Pa$	27 d	$(β^{−})$
$_{92}^{233} U$	1.59 $\times$ 10⁵ y	$(α)$	$_{96}^{242} Cm$	162.8 d	$(α)$
$_{92}^{234} U$	2.45 $\times$ 10⁵ y	$(α)$	$_{97}^{243} Bk$	4.5 h	$(α or E . C .)$
$_{92}^{235} U$	7.03 $\times$ 10⁸ y	$(α)$	$_{99}^{253} Es$	20.47 d	$(α)$
$_{92}^{238} U$	4.47 $\times$ 10⁹ y	$(α)$	$_{100}^{254} Fm$	3.24 h	$(α or S . F .)$
$_{92}^{239} U$	23.54 m	$(β^{−})$	$_{100}^{255} Fm$	20.1 h	$(α)$
$_{93}^{239} Np$	2.3 d	$(β^{−})$	$_{101}^{256} Md$	76 m	$(α or E . C .)$
$_{94}^{239} Pu$	2.407 $\times$ 10⁴ y	$(α)$	$_{102}^{254} No$	55 s	$(α)$
$_{94}^{239} Pu$	6.54 $\times$ 10³ y	$(α)$	$_{103}^{257} Lr$	0.65 s	$(α)$
$_{94}^{241} Pu$	14.4 y	$(α or β −)$	$_{105}^{260} Ha$	1.5 s	$(α or S . F .)$
$_{95}^{241} Am$	432.2 y	$(α)$	$_{106}^{263} Sg$	0.8 s	$(α or S . F .)$

Table M1

Footnotes

1y = years, d = days, h = hours, m = minutes, s = seconds
2E.C. = electron capture, S.F. = Spontaneous fission
3y = years, d = days, h = hours, m = minutes, s = seconds
4E.C. = electron capture, S.F. = Spontaneous fission

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